Changed default handler delegate method

In many cases (especially on the iPad), if a new controller is
presented in response to an action of UIActionSheet by using the
clickedButtonAtIndex delegate method, the presentation fail because the
action sheet is still shown (a warning in the console confirm this). By
calling the default handlers on DidDismiss this problem is solved.
Merge branch 'master' of https://github.com/adams79/BlocksKit into adams79-master

Conflicts:
	BlocksKit/UIKit/UIActionSheet+BlocksKit.m
Merge branch 'adams79-master' into next
Fixes some header import issues. Partially addresses #248.